Let \(G\,=\,\mathrm {SU}(2)\) .
By [1]}, Proposition 3.1,
the symplectic form on \({\mathcal {M}}^{\mathfrak {g}}\)  is nondegenerate provided
\(\Lambda \,= \,0 \)  or \(\Lambda \,\notin \, \pi {\mathbb {Z}} H\) ,
where \(H\)  is the diagonal \(2 \times 2\)  matrix with
entries \((\sqrt{-1},\,-\sqrt{-1})\) .
(a generator of the weight lattice of \(G\) ).
